Implement window.print() on Android

chrome/browser/printing/printing_message_filter.cc

Index: chrome/browser/printing/printing_message_filter.cc
diff --git a/chrome/browser/printing/printing_message_filter.cc b/chrome/browser/printing/printing_message_filter.cc
index 6af14f7f13139f166d1dea644f004294a9b5dcdd..8a8271927a46f950a19bafb5e136a968b52865a9 100644
--- a/chrome/browser/printing/printing_message_filter.cc
+++ b/chrome/browser/printing/printing_message_filter.cc
@@ -34,6 +34,7 @@
 
 #if defined(OS_ANDROID)
 #include "base/strings/string_number_conversions.h"
+#include "chrome/browser/android/tab_android.h"
 #include "chrome/browser/printing/print_view_manager_basic.h"
 #include "printing/printing_context_android.h"
 #endif
@@ -129,6 +130,10 @@ bool PrintingMessageFilter::OnMessageReceived(const IPC::Message& message) {
     IPC_MESSAGE_HANDLER(PrintHostMsg_TempFileForPrintingWritten,
                         OnTempFileForPrintingWritten)
 #endif
+#if defined(OS_ANDROID)
+    IPC_MESSAGE_HANDLER_DELAY_REPLY(PrintHostMsg_InitiateAndroidPrint,

[Vitaly Buka (NO REVIEWS), 2014/11/21 17:05:12]

don't need new message

+                                    OnInitiateAndroidPrint)
+#endif
     IPC_MESSAGE_HANDLER(PrintHostMsg_IsPrintingEnabled, OnIsPrintingEnabled)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(PrintHostMsg_GetDefaultPrintSettings,
                                     OnGetDefaultPrintSettings)
@@ -323,6 +328,9 @@ void PrintingMessageFilter::OnScriptedPrint(
     printer_query =
         queue_->CreatePrinterQuery(render_process_id_, reply_msg->routing_id());
   }
+
+  DLOG(INFO) << "DGN OnScriptedPrint - cookie: " << params.cookie;
+
   printer_query->GetSettings(

[Vitaly Buka (NO REVIEWS), 2014/11/21 17:05:12]

Here it goes into Printing::AskUserForSettings and Printing::AskUserForSettings
shows dialog

       PrinterQuery::ASK_USER,
       params.expected_pages_count,
@@ -338,6 +346,9 @@ void PrintingMessageFilter::OnScriptedPrintReply(
     scoped_refptr<PrinterQuery> printer_query,
     IPC::Message* reply_msg) {
   PrintMsg_PrintPages_Params params;
+
+DLOG(INFO) << "DGN OnScriptedPrintReply";
+
 #if defined(OS_ANDROID)
   // We need to save the routing ID here because Send method below deletes the
   // |reply_msg| before we can get the routing ID for the Android code.
@@ -373,6 +384,9 @@ void PrintingMessageFilter::OnScriptedPrintReply(
 #if defined(OS_ANDROID)
 void PrintingMessageFilter::UpdateFileDescriptor(int render_view_id, int fd) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  DLOG(INFO) << "DGN UpdateFileDescriptor";
+
   content::WebContents* wc = GetWebContentsForRenderView(render_view_id);
   if (!wc)
     return;
@@ -380,6 +394,37 @@ void PrintingMessageFilter::UpdateFileDescriptor(int render_view_id, int fd) {
       PrintViewManagerBasic::FromWebContents(wc);
   print_view_manager->set_file_descriptor(base::FileDescriptor(fd, false));
 }
+
+void PrintingMessageFilter::ShowPrintDialog(int render_view_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  content::WebContents* wc = GetWebContentsForRenderView(render_view_id);

[Vitaly Buka (NO REVIEWS), 2014/11/21 17:05:13]

PrintingContext::Delegate suppose provide necessary UI dependence
it's obviously no enough for Android 
so maybe just add PrintingContext::Delegate::ShowDailog.
 

+  TabAndroid* tab = TabAndroid::FromWebContents(wc);
+  if (tab) tab->ShowPrintDialog();
+}
+
+void PrintingMessageFilter::OnInitiateAndroidPrint(int cookie, IPC::Message* reply_msg) {
+
+  DLOG(INFO) << "DGN OnInitiateAndroidPrint - cookie: " << cookie;
+
+  scoped_refptr<PrinterQuery> printer_query = queue_->PopPrinterQuery(cookie);
+  if (!printer_query.get()) {
+    printer_query =
+        queue_->CreatePrinterQuery(render_process_id_, reply_msg->routing_id());

[dgn, 2014/11/20 12:26:16]

Here I'm trying to get/create the PrinterQuery that will later be used in the
OnScriptedPrint method and OnScriptedPrintReply, to have it call my new callback
without having to change too much stuff. But I don't understand enough how the
cookies and printerQueries work, are created and retreived

+  }
+  printer_query->SetInitiatedFromAndroidScript();

[dgn, 2014/11/20 12:26:16]

Placeholder method for test. Eventusally this would bind a callback to be called
when the printing process is finished.

+
+  // we want it to be retrieved by the upcoming OnScriptedPrint call (that does not work)
+  queue_->QueuePrinterQuery(printer_query.get());
+
+  BrowserThread::PostTask(
+          BrowserThread::UI, FROM_HERE,
+          base::Bind(&PrintingMessageFilter::ShowPrintDialog,
+                     this,
+                     reply_msg->routing_id()));
+  DLOG(INFO) << "DGN OnInitiateAndroidPrint - Post task returned";
+  Send(reply_msg); // TODO: Send that only once java's onFinish is called.
+}
+
 #endif
 
 void PrintingMessageFilter::OnUpdatePrintSettings(